A study on the promotion of knowledge acquisition and behavioral change regarding periodontal disease

Last registered on January 31, 2023


Trial Information

General Information

A study on the promotion of knowledge acquisition and behavioral change regarding periodontal disease
Initial registration date
March 05, 2022

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
March 07, 2022, 2:03 PM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
January 31, 2023, 9:47 AM EST

Last updated is the most recent time when changes to the trial's registration were published.



Primary Investigator

Kansai University

Other Primary Investigator(s)

PI Affiliation
Kansai University
PI Affiliation
Kindai University
PI Affiliation
Nagasaki University
PI Affiliation
Tezukayama University
PI Affiliation
Kyoto University of Advanced Science
PI Affiliation
Daito Bunka University

Additional Trial Information

On going
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
In this research, we study causal impacts of interventions which provide information on oral health, especially how to prevent periodontal disease. By conducting online surveys and providing information on prevention and treatment of periodontal disease to randomly selected individuals, we aim to study whether and how people change their perception/behavior on oral health.The third survey asks respondents the same set of questions plus new questions to see whether the intervention persist or not.
External Link(s)

Registration Citation

Inaba, Misato et al. 2023. "A study on the promotion of knowledge acquisition and behavioral change regarding periodontal disease." AEA RCT Registry. January 31. https://doi.org/10.1257/rct.8861-1.1
Experimental Details


This study randomly provides information on how to prevent periodontal disease to 900 individuals in Japan. Our subjects are clients of a major online survey company. We randomly assign each subject to one of the two groups and give information via online.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
The primary outcomes include perceptions and behavioral changes against periodontal disease. These outcomes are measured by comparing the baseline and endline surveys across groups. The third survey is desinged to measure whether the intervention persists or not.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We conduct a survey asking for their perception and behavior about oral health. The survey includes quiz on periodontal disease and its prevention. Subjects in treatment group receive information on quiz answers and the total number of correct answers along with the baseline survey. Subjects in control group are asked to answer the baseline survey, which does not include quiz answers nor the total number of correct answers.
Experimental Design Details
Randomization Method
Stratified randomization by a computer
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Sample size: planned number of observations
900 individuals
Sample size (or number of clusters) by treatment arms
450 individuals * 2 groups
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Research Institute for Socionetwork Strategies, Kansai University, Japan
IRB Approval Date
IRB Approval Number
No. 2021033


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials